[Bug 90520] Register spilling clobbers registers used elsewhere in the shader

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90520

--- Comment #7 from Jason Ekstrand <jason at jlekstrand.net> ---
I did some poking around.  As far as I can tell, the MRF hack properly detects
the implied writes and is setting register interferences for g126 and g127.  I
wasn't able to get much further in my hour or so of poking yesterday.  Ken
suggested that maybe it has something to do with one thing being a vector that
only partially overlaps with the MRF hack.  I find that unlikely, but I guess
it's possible.

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